VVA control of NOx in a low ΔP area of an engine operating map
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United States of America Patent
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Dec 8, 2015
Grant Date -
Jul 17, 2014
app pub date -
Aug 22, 2011
filing date -
Aug 22, 2011
priority date (Note) -
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Abstract
When the difference by which pressure in an engine exhaust manifold exceeds pressure in an engine intake manifold becomes less than a selected difference while an intake valve operating mechanism is closing cylinder intake valves at a selected time in the engine cycle, while an EGR system is conveying the engine exhaust component of an air/exhaust mixture from an exhaust system to an intake system, and a certain quantity of NOx is present in engine exhaust entering the exhaust manifold, the quantity of NOx present in engine exhaust entering the exhaust manifold is reduced below that certain quantity by causing the intake valve operating mechanism to close the cylinder intake valves earlier in the engine cycle than the selected time.
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